Flex conduit / EMT Question

[john6221]

I can't seem to work my Google-fu and I don't understand the NEC well enough.

Can flex conduit/ MC cable / EMT be run underneath joists, perpendicular to them, secured to the underside?

I have a long run to make in my basement and I want to avoid boring holes through the joists. I'd rather just attach it to the underside.

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[bzzzt]

Yes, you can.

If they're old, dry wood, you're better off using metal stud drywall screws (smaller diameter/fine thread) than wood drywall screws or nails. You'll get less splits.

Flex over 6' needs a ground pulled with it.

[zolotiyeruki]

Another yes here.  I have the misfortune to live in NE Illinois, where EMT is required by code, and all of our EMT is secured to the underside of the joists in the basement.